Could some please confirm which of the following options i should do with my solid (brick, no cavity) external wall to give the best insulation and comforming to all building regs etc. i have read alot of topics but still seem like too many options.
i already have the following materials:-
25mm Celotex (1200x2400)
12.5mm Plasterboard (1200x2400)
Treated softwood baton (25x50mm)
option 1
fix baton straight onto wall at 400 centres
celotex between baton pieces
sheet of membrane
plasterboard
option 2
celotex straight onto wall (tape up the seems)
baton onto celotex at 400 centres
plasterboard onto baton
I assume option 2 is the best because it gives me a service cavity and should be better insulated because of celotex covering the whole wall as opposed to baton.
i already have the following materials:-
25mm Celotex (1200x2400)
12.5mm Plasterboard (1200x2400)
Treated softwood baton (25x50mm)
option 1
fix baton straight onto wall at 400 centres
celotex between baton pieces
sheet of membrane
plasterboard
option 2
celotex straight onto wall (tape up the seems)
baton onto celotex at 400 centres
plasterboard onto baton
I assume option 2 is the best because it gives me a service cavity and should be better insulated because of celotex covering the whole wall as opposed to baton.